Question

我不明白为什么这段代码两次打印数组的内容。

static void Main(string[] args)
{
    Int64 userlength;
    Int64 userlengthcounter;
    String unencrypted;
    char current;
    start:
    Console.WriteLine("Please enter how many characters the string you want encrypyted to be:");
    userlength = Convert.ToInt64(Console.ReadLine());
    Console.WriteLine("Please enter the string you want to be encrypted:");
    unencrypted = Console.ReadLine();
    int[] first = new int[userlength];
    int[] second = new int[userlength];
    if (userlength != unencrypted.Length)
    {
        Console.WriteLine("The string you entered was not the same length as the number of characters you specified");
        goto start;
    }
    for (int i = 0; i < userlength; i++)
    {
        Console.WriteLine(unencrypted[i]);
        current = unencrypted[i];
        first[i] = current;

    }
    foreach (char item in first)
    {
        Console.WriteLine(item.ToString());
    }
    Console.ReadLine();
}

例如，输入abcd将返回abcdabcd，我不明白为什么。任何帮助将不胜感激。

Answer 1

这是因为您有两个循环，首先需要在unencrypted循环中的for中打印每个字符，并将字符存储在first数组中。

然后，您遍历数组并使用foreach重新打印字符。

其他说明：使用goto几乎总是是个坏主意，因为它会使您的代码难以理解且难以理解。因为您必须手动跟踪代码跳转的位置。

您可以使用do-while循环来做同样的事情。

do { 
     Console.WriteLine("Please enter how many characters the string you want encrypyted to be:");
     userlength = Convert.ToInt64(Console.ReadLine());
     Console.WriteLine("Please enter the string you want to be encrypted:");
     unencrypted = Console.ReadLine();
     int[] first = new int[userlength];
     int[] second = new int[userlength];

     if (userlength != unencrypted.Length)
     {
        Console.WriteLine("The string you entered was not the same length as the number of characters you specified");
     }   
} while(userlength != unencrypted.Length);

Answer 2

您专门构建“ first”，然后将其打印在foreach中，基本上两次显示相同的内容：

for (int i = 0; i < userlength; i++)
{
    Console.WriteLine(unencrypted[i]);
    current = unencrypted[i];
    first[i] = current;
}

foreach (char item in first)
{
    Console.WriteLine(item.ToString());
}

为什么在C＃中将数组的内容打印两次？

2 个答案: